21100022011015 has 4 divisors (see below), whose sum is σ = 25320026413224. Its totient is φ = 16880017608808.

The previous prime is 21100022011009. The next prime is 21100022011049. The reversal of 21100022011015 is 51011022000112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21100022011015 - 2³ = 21100022011007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21100022011015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2110002201097 + ... + 2110002201106.

It is an arithmetic number, because the mean of its divisors is an integer number (6330006603306).

Almost surely, 2^{21100022011015} is an apocalyptic number.

21100022011015 is a deficient number, since it is larger than the sum of its proper divisors (4220004402209).

21100022011015 is an equidigital number, since it uses as much as digits as its factorization.

21100022011015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4220004402208.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 21100022011015 its reverse (51011022000112), we get a palindrome (72111044011127).

The spelling of 21100022011015 in words is "twenty-one trillion, one hundred billion, twenty-two million, eleven thousand, fifteen".